<!DOCTYPE html>
<html>
<head>
    <title>登录成功!</title>
</head>
<style>
    .loginsuccess > h4 > a {
        text-decoration: none;
    }

    .loginsuccess {
        text-align: center;
        font-size: 70px;
        background: rgb(81, 152, 120);
        position: absolute;
        left: 25%;
        right: 25%;
        top: 10%;
    }

    .a {
        position: relative;
        background: rgb(111, 127, 194);
        width: 50px;
        height: 50px;
        float: right;
    }
</style>
<body>
<div class="loginsuccess">
    <h3>登录成功!!!</h3>
    <h4>5s后返<a href="index.html">首页</a></h4>
</div>
<div class="a">

</div>

</body>
</html>